34
Chapter One
Chemical
Foundations
46. Apothecaries (druggists) use the following set of measures in the
English system:
20 grains ap
=
1 scruple (exact)
3 scruples
=
1 dram ap (exact)
8 dram ap
=
1oz ap (exact)
1 dram ap
=
3.888 g
a. Is an apothecary grain the same as a troy grain? (See Exer
cise 45.)
b. 1 oz ap
=
oz troy.
c. An aspirin tablet contains 5.00 X 10
2
mg of active ingredi
ent. What mass in grains ap of active ingredient does it con
tain? What mass in scruples?
d. What is the mass of 1 scruple in grams?
47. Science fiction often uses nautical analogies to describe space
travel. If the starship
u.S.S.
Enterprise
is traveling at warp
factor 1.71, what is its speed in knots and in miles per hour?
(Warp 1.71
=
5.00 times the speed of light; speed of light
=
3.00 X 10
8
m/s;
1 knot
=
2000 yd/h, exactly.)
48. The world record for the hundred meter dash is 9.74 s. What is the
corresponding average speed in units of
mis,
km/h, ft/s, and miIh?
At this speed, how long would it take to run 1.00 X 10
2
yards?
49. Would a car traveling at a constant speed of 65 krnIh violate a
40. miIh speed limit?
50. You pass a road sign saying "New York 112 km." If you drive
at a constant speed of 65 mi/h, how long should it take you to
reach New York? If your car gets 28 miles to the gallon, how
many liters of gasoline are necessary to travel 112 km?
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 Spring '10
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 Organic chemistry, Carbon monoxide, Fahrenheit, Celsius, dram ap, Fahrenheit degrees. a.

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